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my friend is the same age as me (13) and she hasn't even got discharge and i already have my period.

Dr. Kroman says...

Even though 12 is the average age for your periods to start, the normal range is between 11 and 16 years old. The age you start depends a lot on your genetics and also your body mass index She could ask her mum when she started her periods? Is she quite slim or does she play a lot of sport? While it’s hard not to compare yourself to other girls your age, remember that every girl develops in her own time.